Well, sorry, but I'm convinced that some beancounter is being told to maximise the value of whatever they can flog off, and to keep Jocks in jobs. Defence interest coming a long way behind the land value and the labour party fan club's interests.
The loss of St Mawgan would also have a side effect on trans-Atlantic AAR trails as there'd be only Culdrose, Exeter or Cardiff to use for Bracket 1 abort aerodromes.....
How much was spent bringing Leeming up to the state it is today for the F3? A whole new road off the A1, plus gazillions on infrastructure. So guess what - it'll go to the damn dung-eaters like every other half decent base. Abingdon, Chivenor and Wattisham to name but a few.